[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   36.512628][   T25] audit: type=1800 audit(1570918209.071:25): pid=7092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   36.532459][   T25] audit: type=1800 audit(1570918209.071:26): pid=7092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   36.552517][   T25] audit: type=1800 audit(1570918209.071:27): pid=7092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts.
2019/10/12 22:10:18 fuzzer started
2019/10/12 22:10:20 dialing manager at 10.128.0.105:43913
2019/10/12 22:10:20 syscalls: 2523
2019/10/12 22:10:20 code coverage: enabled
2019/10/12 22:10:20 comparison tracing: enabled
2019/10/12 22:10:20 extra coverage: extra coverage is not supported by the kernel
2019/10/12 22:10:20 setuid sandbox: enabled
2019/10/12 22:10:20 namespace sandbox: enabled
2019/10/12 22:10:20 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/12 22:10:20 fault injection: enabled
2019/10/12 22:10:20 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/12 22:10:20 net packet injection: enabled
2019/10/12 22:10:20 net device setup: enabled
2019/10/12 22:10:20 concurrency sanitizer: enabled
syzkaller login: [   48.186558][    T0] ==================================================================
[   48.194816][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   48.203742][    T0] 
[   48.206068][    T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1:
[   48.213649][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   48.219393][    T0]  do_idle+0x1e0/0x2c0
[   48.225036][    T0]  cpu_startup_entry+0x1b/0x20
[   48.229783][    T0]  start_secondary+0x207/0x260
[   48.234648][    T0]  secondary_startup_64+0xa4/0xb0
[   48.239656][    T0] 
[   48.241977][    T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0:
[   48.249338][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   48.254876][    T0]  do_idle+0x1e0/0x2c0
[   48.259013][    T0]  cpu_startup_entry+0x1b/0x20
[   48.263848][    T0]  rest_init+0xec/0xf6
[   48.267910][    T0]  arch_call_rest_init+0x17/0x37
[   48.273613][    T0]  start_kernel+0x83e/0x864
[   48.278204][    T0]  x86_64_start_reservations+0x29/0x2b
[   48.284162][    T0]  x86_64_start_kernel+0x72/0x76
[   48.289656][    T0]  secondary_startup_64+0xa4/0xb0
[   48.294741][    T0] 
[   48.297193][    T0] Reported by Kernel Concurrency Sanitizer on:
[   48.303334][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   48.310076][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.320116][    T0] ==================================================================
[   48.328183][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   48.335805][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   48.342542][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.352579][    T0] Call Trace:
[   48.355856][    T0]  dump_stack+0xf5/0x159
[   48.360097][    T0]  panic+0x209/0x639
[   48.363975][    T0]  ? secondary_startup_64+0xa4/0xb0
[   48.369151][    T0]  ? vprintk_func+0x8d/0x140
[   48.373759][    T0]  kcsan_report.cold+0xc/0x1b
[   48.378414][    T0]  __kcsan_setup_watchpoint+0x3ee/0x510
[   48.383951][    T0]  __tsan_read4+0x2c/0x30
[   48.388263][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   48.393788][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.400005][    T0]  do_idle+0x1e0/0x2c0
[   48.404063][    T0]  cpu_startup_entry+0x1b/0x20
[   48.408803][    T0]  rest_init+0xec/0xf6
[   48.412858][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   48.420121][    T0]  arch_call_rest_init+0x17/0x37
[   48.425041][    T0]  start_kernel+0x83e/0x864
[   48.429541][    T0]  x86_64_start_reservations+0x29/0x2b
[   48.435077][    T0]  x86_64_start_kernel+0x72/0x76
[   48.439992][    T0]  secondary_startup_64+0xa4/0xb0
[   48.446344][    T0] Kernel Offset: disabled
[   48.450672][    T0] Rebooting in 86400 seconds..